Ambiguous HTTP Request Framing in AIOHTTP Library by aio-libs
CVE-2026-111750

6.3MEDIUM

Key Information:

Vendor

Aio-libs

Status
Aiohttp
Vendor
CVE Published:
19 October 2026

What is CVE-2026-111750?

A vulnerability in the AIOHTTP library prior to version 3.14.4 permits attackers to exploit ambiguous HTTP request framing. When applications use AIOHTTP_NO_EXTENSIONS or operate without a standard wheel, the pure Python parser can misinterpret the HTTP request structure, allowing unauthenticated attackers to smuggle requests. This flaw can lead to various security risks if left unaddressed. Users are encouraged to upgrade to version 3.14.4 or later to mitigate this issue.

Affected Version(s)

aiohttp < 3.14.4

References

https://github.com/aio-libs/aiohttp/security/advisories/G...
x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/9b27347e61454d...
x_refsource_MISC
https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4
x_refsource_MISC

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.